diff --git a/internal/distributed/proxy/httpserver/utils.go b/internal/distributed/proxy/httpserver/utils.go
index 0444a235463f1..0a6f9bfc15548 100644
--- a/internal/distributed/proxy/httpserver/utils.go
+++ b/internal/distributed/proxy/httpserver/utils.go
@@ -1531,7 +1531,7 @@ func convertDefaultValue(value interface{}, dataType schemapb.DataType) (*schema
 		}
 		return data, nil
 	default:
-		return nil, merr.WrapErrParameterInvalidMsg(fmt.Sprintf("Unexpected default value type: %d", dataType))
+		return nil, merr.WrapErrParameterInvalidMsg(fmt.Sprintf("Unexpected default value type: %s", dataType.String()))
 	}
 }